If you have access to a 3D printer, there are free files for an SH-60F upgrade on Cults 3D. Many of the parts can be used on an MH-60L as well. It has collectives, cyclics, wheels, engine parts, etc.
Another option that I recently used was to buy the Kitty Hawk interior sprues off eBay and use them inside the Academy kit. They fit pretty well and have all the details Academy missed. I did this on my recent UH-60A Grenade build.